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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd46d3f8a49e18f133f200805ff19e9cecf702d6a4ebf02d53584a97e916bf2b7' 
  AND token = 'sT5W5dcaeicCHWFOl1Q3l0WKvF1IV3b6JGxaI1/SmxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}